Google Earth
Neal Farley

Google Earth can help you bring the world to your classroom. You can use Google Earth to get your students excited about geography and use different Google Earth layers to study demographics, economics, even mathematics in specific contexts.

Just about everything you could possibly need is out on the web for you.

The links below will get you started.

Google Earth User Guide

Google For Educators

Google Lit Trips

Just posted on the Promethean planet BLOG....
Google Earth 5 in the Promethean Activclassroom

Google Earth Forum

Maybe more than you want to know...